Knee-Pad., patent, December 29, 1897; (https://texashistory.unt.edu/ark:/67531/metapth174473/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Knee-Pad., patent, December 29, 1897; (https://texashistory.unt.edu/ark:/67531/metapth174473/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .